I just googled refraction vs reflection. Hope this helps! :)
Answer: 400 watt
Explanation: Force(f)=20×10N=200N
Displacement (d)=100m
Time(t)=50 sec
We have,
Power=F×d_t=200×100_50
Ans=400 watt
<span>being soft-spoken, compassionate, thoughtful and disrespectful.
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The balloon started to inflate which suggests that the chemical created a reaction and since the chemical couldn't go into the air or out of the flask it created the gas inside which inflated the balloon. Also you can see little bubbles forming and going to the surface which suggests a gas was produced, I hope this made sense lol XD
The true option is a) they form a 90 degree angle.
Pythagorean theorem is valid for right triangles, which is what you can form when the two vectors have a 90 degree angle.
Regarding the other options:
b) They are equal in magnitude: this is not a condition because Pythagoream theorem is valid for any magnitude as long as the angle is 90°C.
c) They have the sam directions: false, because if the two vectors have the same directions the magnitud is the sum of the two magnitudes.
d) They are parallel: false for a similar reason that c) taking into account if they have the same direction or are opposed. .